WHICH 3D PRINTING FILAMENTS FAIL MOST AND WHICH ARE HARDEST TO FIX

Post volume by filament type, filtered to filaments with more than 50 help posts: PLA - 5,433 help posts PETG - 2,526 help posts PLA+ - 1,328 help posts ABS - 403 help posts Silk PLA - 381 help posts ASA - 375 help posts TPU - 344 help posts Carbon Fiber PLA - 211 help posts Nylon - 88 help posts PLA generates more help posts than every other filament combined. This reflects how many people print with it rather than how difficult it is. PLA is the default filament for most printers and most users which means it produces the most help posts by volume regardless of how easy it actually is to work with. PETG at 2,526 posts is second and the gap between PETG and everything else is significant. More than twice as many people ask for help with PETG as with PLA+, which is the third most common. PETG has a reputation for being an easy step up from PLA. The help post volume suggests the reality is more complicated than that. Silk PLA at 381 posts is higher than most people would expect. Silk PLA is often described as just PLA with a shiny finish. The data says it generates nearly as many help requests as ABS and ASA, which are genuinely difficult materials. Silk PLA has real quirks around temperature, cooling, and stringing that its pretty surface finish tends to obscure.

Post volume tells you which filaments cause the most problems in absolute terms. Fix rate tells you which problems are hardest to solve once they occur. Here is the full ranking by confirmed fix rate, from hardest to easiest: Carbon Fiber PLA - 584 total fixes, 361 confirmed (61.8%) TPU - 1,059 total fixes, 667 confirmed (63.0%) PETG - 8,214 total fixes, 5,347 confirmed (65.1%) ABS - 1,206 total fixes, 787 confirmed (65.3%) ASA - 1,295 total fixes, 848 confirmed (65.5%) PLA - 17,785 total fixes, 12,945 confirmed (72.8%) Silk PLA - 1,245 total fixes, 939 confirmed (75.4%) PLA+ - 4,579 total fixes, 3,511 confirmed (76.7%) Nylon - 264 total fixes, 206 confirmed (78.0%)

Carbon Fiber PLA sits at the bottom at 61.8%. This is the hardest filament to fix in the dataset and it surprises most people because CF PLA is marketed as a straightforward upgrade from regular PLA. It prints at similar temperatures and does not require an enclosure. But the abrasive carbon fiber content causes nozzle wear that degrades print quality gradually, the material is brittle and less forgiving of print parameter variations, and diagnosing CF PLA problems requires understanding how the abrasive particles interact with the hotend in ways that standard PLA troubleshooting does not cover. TPU at 63.0% is the second hardest to fix despite being described in many guides as beginner accessible. TPU is flexible which creates unique problems around feeding, retraction, and print speed that standard troubleshooting approaches do not handle well. The material behaves differently enough from rigid filaments that a lot of community advice simply does not transfer. When a TPU print goes wrong the path to fixing it is less well-documented than for any rigid filament. PETG at 65.1% confirms what the post volume data suggested. It generates the second most help requests and has one of the lower fix rates. The combination of high volume and below-average fix rate makes PETG the filament that causes the most overall frustration in the community. It is not the hardest to fix but it is the most commonly encountered hard problem. ABS and ASA sit close together at 65.3% and 65.5%. Both are high-temperature materials that require enclosures and careful ambient temperature management. The fix rates being nearly identical makes sense because the two materials share most of their failure modes and most of their fixes. Nylon leads the dataset at 78.0% despite being considered the most technically demanding common filament. This mirrors the pattern seen in the brand data where more experienced users, who tend to use more demanding materials, generate better fix confirmation rates. Nylon printers know their hardware, describe their problems precisely, and try targeted fixes rather than generic suggestions. PLA+ at 76.7% fixes better than regular PLA at 72.8%. This is counterintuitive because PLA+ is marketed as an improvement over PLA in every dimension. The fix rate difference likely reflects the user base. PLA+ users tend to be slightly more experienced than first-time PLA users and better at diagnosing and confirming fixes. Silk PLA at 75.4% fixes better than its help post volume would suggest. Despite generating nearly as many help posts as ABS, Silk PLA problems tend to be well-understood by the community. The fixes for Silk PLA are more consistent and better documented than for CF PLA or TPU.

If you are choosing a filament and care about how easy it is to troubleshoot when something goes wrong, the data suggests PLA+ is the best starting point - lower problem rate than PETG, higher fix rate than regular PLA, and a large enough user base that community knowledge is deep and well-confirmed. If you are printing with Carbon Fiber PLA or TPU and something has gone wrong, expect the troubleshooting process to take longer than with standard filaments. The community knowledge is thinner and the fix confirmation rates are the lowest in the dataset. Plan for more iteration and be skeptical of generic advice that was written for PLA or PETG. If you are considering PETG as a step up from PLA, go in knowing it is genuinely more demanding than its reputation suggests. The data shows it generates more help posts per user than almost any other filament and fixes at a lower rate than PLA, PLA+, or Silk PLA. FixMyPrint has filament-specific fix data for every supported material, ranked by confirmed outcomes for your specific printer. Try it free at fixmyprint3d.com.